Why doesn't he talk to me?

My guy friend and I cut off on very confusing terms with no closure whatsoever. He pushed me away and walked out of my life. But some of our mutual friends told me that he still misses me. He notices me in the college, but whenever I have tried to talk to him, he basically ignores my text. In college when I approached him, he simply apologized and walked away. What's up with him?